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[/] [openrisc/] [trunk/] [gnu-stable/] [gcc-4.5.1/] [libcpp/] [identifiers.c] - Blame information for rev 859

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1 270 jeremybenn
/* Hash tables for the CPP library.
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   Copyright (C) 1986, 1987, 1989, 1992, 1993, 1994, 1995, 1996, 1998,
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   1999, 2000, 2001, 2002, 2007, 2009 Free Software Foundation, Inc.
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   Written by Per Bothner, 1994.
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   Based on CCCP program by Paul Rubin, June 1986
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   Adapted to ANSI C, Richard Stallman, Jan 1987
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This program is free software; you can redistribute it and/or modify it
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under the terms of the GNU General Public License as published by the
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Free Software Foundation; either version 3, or (at your option) any
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later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; see the file COPYING3.  If not see
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<http://www.gnu.org/licenses/>.
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 In other words, you are welcome to use, share and improve this program.
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 You are forbidden to forbid anyone else to use, share and improve
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 what you give them.   Help stamp out software-hoarding!  */
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#include "config.h"
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#include "system.h"
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#include "cpplib.h"
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#include "internal.h"
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static hashnode alloc_node (hash_table *);
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/* Return an identifier node for hashtable.c.  Used by cpplib except
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   when integrated with the C front ends.  */
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static hashnode
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alloc_node (hash_table *table)
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{
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  cpp_hashnode *node;
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  node = XOBNEW (&table->pfile->hash_ob, cpp_hashnode);
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  memset (node, 0, sizeof (cpp_hashnode));
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  return HT_NODE (node);
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}
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/* Set up the identifier hash table.  Use TABLE if non-null, otherwise
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   create our own.  */
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void
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_cpp_init_hashtable (cpp_reader *pfile, hash_table *table)
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{
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  struct spec_nodes *s;
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  if (table == NULL)
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    {
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      pfile->our_hashtable = 1;
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      table = ht_create (13);   /* 8K (=2^13) entries.  */
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      table->alloc_node = alloc_node;
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      _obstack_begin (&pfile->hash_ob, 0, 0,
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                      (void *(*) (long)) xmalloc,
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                      (void (*) (void *)) free);
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    }
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  table->pfile = pfile;
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  pfile->hash_table = table;
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  /* Now we can initialize things that use the hash table.  */
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  _cpp_init_directives (pfile);
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  _cpp_init_internal_pragmas (pfile);
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  s = &pfile->spec_nodes;
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  s->n_defined          = cpp_lookup (pfile, DSC("defined"));
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  s->n_true             = cpp_lookup (pfile, DSC("true"));
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  s->n_false            = cpp_lookup (pfile, DSC("false"));
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  s->n__VA_ARGS__       = cpp_lookup (pfile, DSC("__VA_ARGS__"));
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  s->n__VA_ARGS__->flags |= NODE_DIAGNOSTIC;
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}
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/* Tear down the identifier hash table.  */
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void
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_cpp_destroy_hashtable (cpp_reader *pfile)
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{
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  if (pfile->our_hashtable)
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    {
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      ht_destroy (pfile->hash_table);
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      obstack_free (&pfile->hash_ob, 0);
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    }
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}
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/* Returns the hash entry for the STR of length LEN, creating one
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   if necessary.  */
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cpp_hashnode *
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cpp_lookup (cpp_reader *pfile, const unsigned char *str, unsigned int len)
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{
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  /* ht_lookup cannot return NULL.  */
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  return CPP_HASHNODE (ht_lookup (pfile->hash_table, str, len, HT_ALLOC));
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}
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/* Determine whether the str STR, of length LEN, is a defined macro.  */
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int
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cpp_defined (cpp_reader *pfile, const unsigned char *str, int len)
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{
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  cpp_hashnode *node;
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  node = CPP_HASHNODE (ht_lookup (pfile->hash_table, str, len, HT_NO_INSERT));
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  /* If it's of type NT_MACRO, it cannot be poisoned.  */
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  return node && node->type == NT_MACRO;
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}
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/* We don't need a proxy since the hash table's identifier comes first
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   in cpp_hashnode.  However, in case this is ever changed, we have a
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   static assertion for it.  */
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extern char proxy_assertion_broken[offsetof (struct cpp_hashnode, ident) == 0 ? 1 : -1];
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/* For all nodes in the hashtable, callback CB with parameters PFILE,
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   the node, and V.  */
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void
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cpp_forall_identifiers (cpp_reader *pfile, cpp_cb cb, void *v)
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{
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  ht_forall (pfile->hash_table, (ht_cb) cb, v);
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}

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